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Training Neural Networks with Backpropagation. Original Publication.

May 17, 2017
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Training Neural Networks with Backpropagation. Original Publication.

Neural networks have been a very important area of scientific study that has evolved by different disciplines such as mathematics, biology, psychology, computer science, etc.The study of neural networks leapt from theory to practice with the emergence of computers.Training a neural network by adjusting the weights of the connections is computationally very expensive so its application to practical problems...

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Looking for a Programming or Statistics High Level Course? MIT Open Course Ware.

Looking for a Programming or Statistics High Level Course? MIT Open Course Ware.

Although MIT OCW has been operating for more than 15 years, I consider it important to do this post as there are still many people who do not know about its existence.MIT OpenCourseWare (OCW) is a web-based publication of virtually all MIT course co...

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Machine Learning. Regression Trees and Model Trees (Predicting Wine Quality)

We will develop a forecasting example using model trees and regression trees algorithms. The exercise was originally published in "Machine Learning in R" by Brett Lantz, PACKT publishing 2015 (open source community experience destilled).The example we will develop is about predicting wine quality.Image from Wine FollyWe will carry out the exercise verbatim as published in the aforementioned reference.For more...

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MIT Step by Step Instructions for Creating Your Own R Package.

We will mention the steps to create your own R package using RStudio and we will provide the link to download the complete MIT guide:"Instructions for Creating Your Own R Package", In Song kim, Phil Martin, Nina McMurry. February 23, 2016 .1. Start by ...

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Function to Simulate Parabolic Shot with Drag.

February 2, 2017
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Function to Simulate Parabolic Shot with Drag.

Script to calculate the most important quantitative information of the drag parabolic shot in International System of Units.If you want to use another system of units you can do it by making some simple changes.This is a first approach to the problem and is totally perfectible.To calculate the maximum range, a transcendental equation is solved regularly, but here...

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Distribution of Mean of the Combinations of a Set.

January 24, 2017
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Distribution of Mean of the Combinations of a Set.

For some purpose I found myself generating and analyzing the average of the combinations of a set and when I generated the corresponding histogram I was surprised by its shape.It should be remembered that the combinations C(m, n) of a set are the number of subsets of a set of m elements taken from...

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Simulating some synthetic data.

January 12, 2017
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Simulating some synthetic data.

In many cases we require some data with certain characteristics to develop a model, perform research, to test an algorithm or simply to practice.Here I show an example of how to generate some synthetic data that can help you to generate your own.We will need the ggplot2 library to display our data:library(ggplot2)Now we define the dimensions of the...

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Exercise to Simulate and Fit a Parabolic Shot.

January 10, 2017
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Exercise to Simulate and Fit a Parabolic Shot.

In this exercise we assume that we obtained the measurements of the height and the distance of the movement of a projectile by means of an experiment.We define the vectors "Height" and "Distance" that have our physical measurements.We fit a second-order model "lmr".We defined a scale of heights "nh" to evaluate the motion equation. With the coefficients...

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Function to create an amortization fund table in R

January 3, 2017
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Function to create an amortization fund table in R

Function to create an amortization fund table.We establish the precision with which we want to work options(digits = 7)we say we do not want to work in scientific notation  options(scipen = 999) We declare vectors to store the values of the different variablesI

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Brief tutorial to perform descriptive statistics using R with two examples.

January 3, 2017
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Brief tutorial to perform descriptive statistics using R with two examples.

Using a pair of databases we will do a brief and basic analysis of descriptive statistics using R.At the end of the article you can find the corresponding links to get both the script and the databases so that you can perform the exercise. Install and load the packages we are going to useinstall.packages("sm")install.packages("plotrix")library(sm)library(plotrix)library(grDevices)  It is Necessary...

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